1305690 has 32 divisors (see below), whose sum is σ = 3182976. Its totient is φ = 342720.

The previous prime is 1305679. The next prime is 1305691. The reversal of 1305690 is 965031.

It is a super-2 number, since 2×1305690² = 3409652752200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1305690.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1824 + ... + 2436.

It is an arithmetic number, because the mean of its divisors is an integer number (99468).

2^1305690 is an apocalyptic number.

1305690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1305690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591488).

1305690 is an abundant number, since it is smaller than the sum of its proper divisors (1877286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1305690 is a wasteful number, since it uses less digits than its factorization.

1305690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 1305690 is about 1142.6679307655. The cubic root of 1305690 is about 109.2982879780.

The spelling of 1305690 in words is "one million, three hundred five thousand, six hundred ninety".